Radar reflector

A folding radar reflector of the kind which is made up of eight mutually adjoining rignt-angled tetrahedrons having a common apex, with the bases of the said tetrahedrons not being physically present but forming a regular octahedron whose centre is the said common apex, wherein the reflector has a covering which before being fitted is formed by three squares of a flexible reflective material, each of which is cut along one line joining the centre of the square to the periphery thereof joining the centre, and each square being joined to another square at the said lines of another square in such a way so as to form a helix, the said covering being held under tension by a rigid frame after the said reflector has been unfolded, said frame comprising a central hub, six pairs of rods hinged to said central hub so that two rods form an upper rib, four pairs of rods are able to pivot through an angle of 90.degree., and a final lower pair of rods able to pivot individually through 180.degree., whereby all the rods lie parallel to the rods of the upper rib when the reflector is folded, and wherein the lower rods of the lower pair are provided at the ends with hooks which co-operates with a ring which holds them in the closed position, thus tensioning the covering to the reflector and locking the reflector in its assembled position.